Apparatus for the production of process printing-plates.



USSY.

Patented Sept 22,1903.

THE PRODUCTION OF PROCESS PRINTING PLATES. nruonmx FILED anr'r. 10,1901,

H. e. BARTHOLOMEW & H. M. B APPABATUS FOB wfsoa s UNITED SL- lldlllifl OFFICE.

APPARATUS F011 THE PRODUCTION OF PROCESS PRINTING-PLATES.

Specification of Letters Patent.

Pat-exited Sept. 22, 19b8- Application ttlcrl September 10, 1907. Serial No. 392.243.

llaunr (it'r Bu:-

tone. line. and other process printing plates.

it has for its objt't'tto reduce the tune occupied ill the ctclun,- of such plates. and

thereby the cost of the labor required there for, and it is particularly designed for use it the reparation of plates for work. in which pictorial representations current events are given.

2uin the time required for etching plates is o considerable importance and value.

For this purpose the present inventioi consists in th prorision of a by the whole surface of the p is br ught, while. in a horizont ate,to be etchei wherein a savin;

ad, or approximately horizontal, position, into rapid and repeated contact \\'llll the surface of the acid bath, :nstead of permitting the acid to flow backward and forward over same, or to pumped or thrown on to the plate as herelofonusual.

In order that the details of conslructiot and the action of the invention may understood, reference is made to the accom partying drawings. in which:-

be clearly Figure l, is a cross sectional elevation and Fig. 2 afront elevation of the improved ap pant-us.

Figs. 3 and 4, are a. plan and cross section resiectivcly, on a slightly enlarged scale, of t. ie frame for holding the plates during the process of etchin".

a. is a vessel for the acid bath composed o iorcehiinor other suit able material. )0 constructed as shown vessel l for the water bath, or

desired. 1'. is at u. vcrlica upper end of the rod d,

progecting studs, f, 'f, which ta it may in one piece with the separately, as

)luuger attached to the lower end of lly reciprocating rod (1, which passes through a suitabl) buslied opening formed centrallv in the cover a, of the vessel (1. The i is bifurcated, and each of the bifurcated arms e, c hasinwardly he into it cant of the cam nlate.

t II, which is fixed u-centrically E the hand wheels j, j.

l", is a door or shutter of aluminium, or

- other suitable material wluch will resist the action of the. acid, for closing the. opening I, in the front of the vessel a. It is sup )orted b couuterlmlance wewhts m, \rlnc' run over pnileys n, in suitable openings formed in the upper )0t'llnlt of the wooden framework A, v tile portions A, of which the shaft 1 is also carried.

The operation of the apparatus is as folusual manner in the frame p, which has its sides beveled to enable it to slide, when iassed through the. opening I, into the correspondingly shaped under face of the plunger c. When the frame p, containin the plates to be etched is in position in' the plunger, the surfaces to be etched are face downwards. The opening I, lowering the door, or shutter k, and on motion being imparted to the wheel j, by the handle q, such motion will be transmitted by the band 8, to the wheel j on the end of the shaft 1', which will cause the cam plate h, to revolve. 'lhe projecting studs f, secured to the bifurcated arms c, c, of t to rod J, will thereupon be caused to travel in the. annular path g, on each faceof the plate h, the resultant \'lllltttll rcei iroeating motion bring in; the plunger c, flllt with it the surfaces of the. plates 0, O, 0, into ra )id and repeated contactwith the surface only of the acid in the bath a. When the plates have been sutlieiently etched the shutter k,- is raised and the frame 1;, withdrawn from the plunger c, through the opening I, by means of the handle r, when it is deposited in the water bath b, to be washed in the usual manner.

Ne are aware that )Xit)! to our invention etching apparatus willi reciprocating plungers operating in acid baths have been -pro arsed. We do not claim such a combination xroadly; but

What we do claim as of our invention, and desire to secure by Letters Patent is An apparatus for etching half tone or other printing plates comprising a closed chamber having an opening therein, a door closing said opening, a \esscl adjacent said chamber and opposite the opening therein, a nluuucr in buld llltltllb 'l', a rod connected is then closed by 2 v I i 899,019

to the said plunger, a cam engaging with the names to this specification in the presence of rod for rel-clprocatinglthle sumel, means for two subscribing witnesses.

rotatin Lie cam, sanc l nger mvin a. rew ce'ss in its under [ace pr vidcd with lzvelcd wi m i pdges and a plate carrying frame havin Mom beveled edges adapted to engage in sai \Vitnesses: recess. F. L. RAND,

In testimony whereof we have signed our J.-\.\IES G. STOKE! 

